HP 3000 Manuals

HP C/iX Library Reference Manual

erfc 

Returns the complementary error function of the input value.

Syntax 

     #include <math.h>
     double erfc (double x);

Parameters 

x             A real number defining the upper limit of the integral.

Return Values 

n             The complement of the integral given by the error function
              from 0 to x.

Description 

The erfc function returns the complementary error function, 1- erf(x).
This function is provided because of the extreme loss of relative
accuracy when erf(x) is called for large values of x.  If erf(5) is
called and the return value subtracted from 1, 12 places of accuracy are
lost when compared to calling erfc(5).

See Also 

exp(), erf()

MPE/iX 5.0 Documentation